Owen moran



(No Model.)

0. MORAN.

TELEPHONE TRANSMITTER.

No. 587,593. Patented Aug.'3,1897.

IN VE N TOR 9110a .%W

WITNESSES A TTO/H/EI In areas 00, Pnoroumo. wasmunmn u c UNITED STATESPATENT OFFICE.

GIVEN MORAN, OF NEW YORK, N. Y.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 587,593, dated August3, 1897.

Application filed December 22, 1896. Serial No. 616,587. (No model.)

To aZZ whom it may concern.-

Be it known that I, OWEN MORAN, a citizen of the United States, and aresident of New York, in the county of New York and State of New York,have invented certain new and useful ImprovementsinTelephone-Transmitters, of which the following is a specification.

My invention relates especially to that class of telephone-transmittersin which are incorporated granules of carbon or other conductingmaterial in a loose state; and it consists of certain novel features ofconstruction for producing various advantageous results, as hereinafterfully set forth.

In the accompanying drawings, Figure 1 represents a vertical centralsection of a transmitter embodying my invention. Fig. 2 represents aplan view thereof with the cap removed and portions of the mica ringbroken away to expose the carbon block beneath it. Fig. 3 represents aninverted plan view of the instrument.

Similar letters of reference indicate corresponding parts.

The letter A indicates the box or casing, and B the cap fitted thereonwith the diaphragm 0 between it and the box, said cap having themouthpiece B formed integral therewith.

The letterD indicates a carbon block, which is situated centrally withinthe casing A and which has a central hole extending therethrough for thereception of granules of carbon or other like electric material in aloose state. These granules of conducting material are supported bymeans of a set-screw E, which extends through the bottom of the casingupwardly into said hole of the carbon block and through a metallic plateF, secured to the interior of the bottom of the casing. At a pointcentral to the diaphragm G and extending downwardly therefrom is acarbon pencil G, which is fitted into a central hole or opening of thecarbon block D in such a manner as to be capable of free up-and-downmovement therein. This carbon pencil G in practice contacts with thegranules of carbon contained within said central hole of the carbonblock D and jointly with the diaphragm G forms one of the electrodes ofthe instrument, of which the other electrode is formed by means of themetallic plate F coacting with one of two more screws, serving to fastensaid plate to the casing. The set-screws, besides acting as a supportfor the loose granules, constitute an adjusting medium there for inrelation to the carbon pencil, and in order to prevent the escape of thegranules in an upward direction from their containing hole or socket thecarbon block D is provided on its upper part with a ring J, of mica orother insulating material, and fastened to the carbon block, which is ofa diameter to fit snugly around the carbon pencil G without impeding itsround movement in undulations of the diaphragm to which it is subjectedin the operation of the instrument.

WVhat I claim as new, and desire to secure by Letters Patent, is

1. In a telephone-transmitter the combination with the casing, the capfitted thereon having a suitable mouthpiece and with the diaphragmbetween said casing and cap, of the carbon block within the casinghaving a central hole extending therethrough for the reception ofgranules of carbon or other conducting material in a loose state, aset-screw extending through the bottom of the casing upwardly into saidhole of the carbon block to form a support and adjusting medium for theloose granules and a carbon pencil extending downwardly from thediaphragminto said hole of the carbon block to contact with granules,substantially as shown and described.

2. In a telephone-transmitter the combination with the casing, the capfitted thereon, having a suitable mouthpiece and the diaphragm betweensaid casing and cap, of the carbon block within the casing, a centralhole extending therethrough for the reception of granules of carbon orother conducting material in a loose state, a metallic plate secured tothe interior of the bottom of the casing to act as a support for thecarbon block and form one of the electrodes of the instrument, aset-screw extendingthrough the bottom of the casing and through saidmetallic plate upwardly into said hole of the carbon block to form asupport and adjusting medium for the loose granules therein, and acarbon pencil extending downwardly from the diaphragm into said hole ofthe carbon block to contact with said granules, substantially as shownand described.

3. In a telephone-transmitter the combination of the followinginstrumentalities, a casing, a cap fitted thereon with a suitablemouthpiece, a diaphragm between said casing and cap, a carbon blockwithin the casing having a central hole extending therethrough for thereception of granules of carbon or other conducting material in a loosestate, a metallic plate secured to the interior of the bottom of thecasing to act as a support for the carbon block and form one of theelectrodes of the transmitter, a set-screw extending through the bottomof the casing and through said around said carbon pencil for preventingthe escape of the granules at that point, substantially as shown anddescribed.

OWEN MORAN.

Vitnesses:

JosIA '1. LOVEJOY, FRANCIS O. BOWEN.

